itouch generations

Sun's jvmgenerationalcollecting (garbage collection) principle is that it divides objects into younger generations (young), older generations (tenured), and persistent generations (Perm), using different algorithms for objects of different lifecycles. (Based on the object life cycle analysis)1.Young (Young Generation)The young generation is divided into three dis

the offset of the next instruction to be executed in the method, and the stack frames are stored in each stack frame, and each stack frame corresponds to each call of each method, and the stack frame is made up of the local variable area and the operand stack. Local variables are used to store local variables and parameters in the method, which are used to store the intermediate results produced during the execution of the method.Memory Management and garbage collectionJVM Memory Composition St

thread is still running. Mechanisms for recycling According to statistical analysis, Java (including some other high-level languages) in most of the object lifecycle is short-lived, so the Java memory Generation management. The purpose of generational is simply to use different management strategies (algorithms) for different generations of memory blocks to maximize performance. Compared with the old generation, usually younger generation is much s

, there will always be an empty survivor area for a period of time. After several GC cycles, the surviving objects are transferred to the old generation memory space. This is usually done by setting an age threshold before the younger generation is eligible to ascend to the old age. Old generationOlder generations of memory contain long-lived objects and objects that survived multiple minor GC. Garbage collection is usually done in the old ye

the generation and then to the second generation. With different threshold settings, Python can process these objects at different intervals. Python handles the most frequent 0 generations, followed by a generation and then the second generation.The weak generation hypothesisTake a look at the core behavior of the garbage collection algorithm: The garbage collector handles new objects more frequently. A new object is what your program just created, a

: // The apple-touch-icon image is automatically processed into rounded corners and highlights. // Apple-touch-icon-precomposed prohibits the system from automatically adding results to directly display the design source image. // IPhone and iTouch, 57x57 pixels by default, must have // IPad, 72x72 pixels, which can be none, but recommended // Retina iPhone and Retina

, you need to write aMost 4.7~5-inch Android devices have a viewport width of 360px,iphone 6, while the majority of 5.5-inch Android machines (such as Samsung Note) have a viewport width of 400,iphone 6 Plus 414px.iOS devicesTitle added to the home screen (IOS 6 new)Whether to enable WEBAPP full screen modeSet the background color of the status barOnly valid when "apple-mobile-web-app-capable" content= "yes"Content parameters: Default defaults. Black status bar background is dark.

automaticallyIOS iconRel parameter:Apple-touch-icon images are automatically processed as rounded corners and highlights.Apple-touch-icon-precomposed prohibits the system from automatically adding results to directly display the design source image.IPhone and iTouch, 57x57 pixels by default, must haveIPad, 72x72 pixels, no, but recommendedRetina iPhone and Retina iTouch, 114x114 pixels, no, but we recommen

Http://bbs.kafan.cn/thread-964921-1-1.html [Reprinted] Build WiFi hotspots for Windows 7 laptops, and provide tutorials for accessing the Internet from iPhone and Other DevicesObjective: To enable Windows 7 laptop to become a Wi-Fi hotspot in certain conditions (for example, dormitories, hotels, and companies without WiFi but with a network cable that can access the Internet, bring your iPhone, iPad, and itouch online.The technology comes from the ne

IOS sales figures (March) • 0.1 billion iPhones • 10 million itouch • 15 million iPad • 27% smartphone shares • 70% tablet shares • 0.35 million apps • 10 billion downloads • 2 billion distributed to developers • 70 thousand developers • millions of downloads per day • an average of over 60 target app customers for each mobile phone • iPhone users include the most elite part of the smartphone user base • younger iPhone users • iPhone user base educate

, you must restart the iPhone to enter the original itouch-like interface (Springboard is the springboard, but I don't know how to translate it)04. set to automatically lock your phone to "never" (on iPhone: Settings> General> auto-lock> never)05. Now download winscp is: http://winscp.net/download/winscp404setup.exe06. Find the automatically assigned IP address of the iPhone from the wireless router. The search procedure is Settings> Wi-Fi> "your sele

modeSet the background color of the status barOnly "apple-mobile-web-app-capable" content="yes" when it is in effectContent parameters: defaultThe default value. blackThe status bar background is black. black-translucentThe status bar background is black translucent. If set to default or black , the page content starts at the bottom of the status bar.If set to black-translucent , the page content fills the entire screen, the top is obscured by the st

-->Enable WEBAPP full screen mode to remove Apple's default toolbar and menu barSet the title after adding to the home screenThe color of the status bar (top bar of the screen) in the Web App app, default (white) Black (black) black-translucent (gray translucent)A value of "black-translucent" will occupy the page position (will overwrite the page 20px height –iphone4 and itouch4 Retina screen is 40px).Ignore the number on the page to identify as the phone, ignoring email identificationIOS Add

interactive program may require a smaller application's pause time, but the time-to-go execution is more important for a non-interactive program. A real-time application may need to have a high value in both areas of garbage collection pause application time and the time ratio spent on garbage collection. Applications on personal computers or embedded systems are most concerned with a smaller resource metering (that is, the use of virtual machine resources).Generation of garbage collectionIn vi

: Import Gcprint (Gc.get_threshold ()) Return (700, 10, 10), followed by two 10 is the threshold associated with generational collection, which can be seen later. 700 is the threshold at which garbage collection starts. Can be reset by the Set_threshold () method in the GC.We can also start the garbage collection manually, that is, using Gc.collect ().Generational recyclingPython also uses the strategy of generational (generation) recycling. The basic assumption of this strategy is that the long

list. Naturally, each collected object needs to provide some more information, the following code is the object of the collection must appear. 1 is stored before the object structure. */2 typedef Union _GC_HEAD {3 struct {4 Union _gc_head *GC_ Next; 5 Union _gc_head *Gc_prev; 6 py_ssize_t gc_refs; 7 } GC; 8 a long double dummy; /* Force worst-case Alignment */9 } pygc_head; The actual structure of an object: Each recycled object is co

objects, many objects quickly produce and disappear, but there are also some objects that are used for a long time. For the sake of trust and efficiency, we believe in the usefulness of these "longevity" objects, so we reduce the frequency of scanning them in garbage collection.The little guy needs more tests.Python divides all the objects into 0,1,2 three generations. All new objects are 0-generation objects. When a generation of objects has gone th

Young Generation Size Selection Response Time-First application : as large as possible until the minimum response time limit of the system is approached (depending on the actual situation). In such cases, the frequency at which the young generation collects occurs is also minimal. At the same time, reduce the reach of older generations of objects. throughput-First application : as large as possible, may reach Gbit degree. Because

application : as large as possible until the minimum response time limit of the system is approached (depending on the actual situation). In such cases, the frequency at which the young generation collects occurs is also minimal. At the same time, reduce the reach of older generations of objects. throughput-First application : as large as possible, may reach Gbit degree. Because there is no requirement for response time, garbage collection can

obtaining high precision requires a very large sequencing depth.Chia-pet is marked by a specific protein factor and its associated chromatin interaction. The technique combines a paired end-label sequencing technique with chip to cross-connect a DNA fragment enriched with a protein that can be used to determine the long-range interaction of chromatin by a specific transcription factor of the entire genome, thus presenting high specificity and high resolution chromatin interactions.What is hi-c